Kenya's government said a Sudanese man trained by al Qaeda was among the leaders of a raid on a Nairobi shopping mall in which at least 67 people were killed, the worst attack in the country in 15 years.
Al Qaeda-linked group al Shabaab has claimed responsibility for the assault two weeks ago on the Westgate centre, saying it was an act of revenge for Kenya's military campaign in Somalia, but the identities of the gunmen have remained unclear.
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A 16-year-old boy has been arrested on suspicion of terror offences as he prepared to leave the UK.
An man is reported to have wounded at least five people - two seriously - in an attack in the Swiss town of Schaffhausen.
Donald Trump's son-in-law has denied any improper conduct during four contacts with Russians during and after the presidential election.